Viessmann error codes
5 documented Viessmann error codes, with meaning, probable causes and a guided diagnostic tree in the app.
HVACIQ
- 0F — Flue Gas Sensor Fault / Exhaust Blockage
- A1 — Ignition Failure / No Flame Detected
- F2 — Heat Exchanger Overheating / Scale Buildup
- F4 — Low Water Pressure / Pressure Switch Open
- F5 — Circulation Pump Fault / No Water Flow
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